##### Table of Contents



UNITED STATES SECURITIES AND EXCHANGE COMMISSION
 Washington, D.C. 20549
 FORM 10-Q
  þ
    
    QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
 For the quarterly period ended June 30, 2010
 OR
 o
    
    TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
 For the transition period from  to
 Commission File Number 1-7584
 TRANSCONTINENTAL GAS PIPE LINE COMPANY, LLC
  Delaware
(State or Other Jurisdiction of 
Incorporation or Organization)
    
    74-1079400
(I.R.S. Employer
Identification No.)2800 Post Oak Boulevard 
P. O. Box 1396
Houston, Texas
(Address of Principal Executive Offices)
    
    77251
(Zip Code)
 713-215-2000
(Registrants Telephone Number, Including Area Code)
 No Change
(Former Name, Former Address and Former Fiscal Year, if Changed Since Last Report)
 Indicate by check mark whether the registrant: (1) has filed all reports required to be
filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months
(or for such shorter period that the registrant was required to file such reports), and (2) has
been subject to such filing requirements for the past 90 days. Yes þ No o
 Indicate by check mark whether the registrant has submitted electronically and posted on
its corporate Web site, if any, every Interactive Data File required to be submitted and posted
pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months
(or for such shorter period that the registrant was required to submit and post such files).
Yes o No o
 Indicate by check mark whether the registrant is a large accelerated filer, an accelerated
filer, a non-accelerated filer, or a smaller reporting company. See the definitions of large
accelerated filer, accelerated filer, and smaller reporting company in Rule 12b-2 of the
Exchange Act. (Check one):
 Large accelerated filero
    
    Accelerated filer o
    
    Non-accelerated filer þ
    
    Smaller reporting company o(Do not check if a smaller reporting company)
 Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of
the Exchange Act). Yes o No þ
 REGISTRANT MEETS THE CONDITIONS SET FORTH IN GENERAL INSTRUCTION H (1)(a) AND (b) OF FORM 10-Q
AND IS THEREFORE FILING THIS FORM 10-Q WITH THE REDUCED DISCLOSURE FORMAT.




---



##### 



PagePART I. FINANCIAL INFORMATION:Item 1. Financial Statements -Condensed Consolidated Statement of Income for the three and six months ended
June 30, 2010 and 2009
    
    
    5Condensed Consolidated Balance Sheet as of June 30, 2010 and December 31, 2009
    
    
    6Condensed Consolidated Statement of Cash Flows for the six months ended June
30, 2010 and 2009
    
    
    8Notes to Condensed Consolidated Financial Statements
    
    
    9Item 2. Managements Discussion and Analysis of Financial Condition and Results
of Operations
    
    
    18Item 3. Quantitative and Qualitative Disclosures About Market Risk
    
    
    23Item 4. Control and Procedures
    
    
    23PART II. OTHER INFORMATION
    
    
    24Item 1. Legal Proceedings
    
    
    24Item 1A. Risk Factors
    
    
    24Item 6. Exhibits
    
    
    25EX-31.1EX-31.2EX-32
  Forward Looking Statements
   2




---



##### Table of Contents




    
    Amounts and nature of future capital expenditures;
    
    Expansion and growth of our business and operations;
    
    Financial condition and liquidity;
    
    Business strategy;
    
    Cash flow from operations or results of operations;
    
    Rate case filings; and
    
    Natural gas prices and demand.
  
    
    Availability of supplies (including the uncertainties inherent in assessing and
estimating future natural gas reserves), market demand, volatility of prices, and the
availability and cost of capital;
    
    Inflation, interest rates and general economic conditions (including future disruptions
and volatility in the global credit markets and the impact of these events on our customers
and suppliers);
    
    The strength and financial resources of our competitors;
    
    Development of alternative energy sources;
    
    The impact of operational and development hazards;
    
    Cost of, changes in, or the results of laws, government regulations (including proposed
climate change legislation and/or potential additional regulation of drilling and completion of wells),
environmental liabilities, litigation and rate proceedings;
    
    Our allocated costs for defined benefit pension plans and other postretirement benefit
plans sponsored by our affiliates;
    
    Changes in maintenance and construction costs;
 3




---



##### Table of Contents




    
    Changes in the current geopolitical situation;
    
    Our exposure to the credit risk of our customers;
    
    Risks related to strategy and financing, including restrictions stemming from our debt
agreements, future changes in our credit rating and the availability and cost of credit:
    
    Risks associated with future weather conditions;
    
    Acts of terrorism; and
    
    Additional risks described in our filings with the Securities and Exchange Commission
(SEC).
    4




---



##### Table of Contents



PART 1   FINANCIAL INFORMATION.
 
 ITEM 1. Financial Statements.
  
 
 Three Months Ended
    
    
    Six Months EndedJune 30,
    
    
    June 30,2010
    
    
    2009
    
    
    2010
    
    
    2009(Restated)
    
    
    
    
    
    
    (Restated)Operating Revenues:Natural gas sales
    
    $
    15,706
    
    
    $
    50,324
    
    
    $
    43,428
    
    
    $
    63,343Natural gas transportation
    
    
    223,338
    
    
    
    216,513
    
    
    
    457,653
    
    
    
    446,496Natural gas storage
    
    
    36,302
    
    
    
    35,867
    
    
    
    73,490
    
    
    
    72,356Other
    
    
    1,335
    
    
    
    10,550
    
    
    
    3,159
    
    
    
    21,238Total operating revenues
    
    
    276,681
    
    
    
    313,254
    
    
    
    577,730
    
    
    
    603,433Operating Costs and Expenses:Cost of natural gas sales
    
    
    15,706
    
    
    
    50,324
    
    
    
    43,428
    
    
    
    63,342Cost of natural gas transportation
    
    
    3,808
    
    
    
    3,174
    
    
    
    12,337
    
    
    
    9,849Operation and maintenance
    
    
    62,609
    
    
    
    60,678
    
    
    
    121,461
    
    
    
    121,328Administrative and general
    
    
    40,055
    
    
    
    39,962
    
    
    
    75,171
    
    
    
    80,282Depreciation and amortization
    
    
    62,502
    
    
    
    60,781
    
    
    
    124,996
    
    
    
    121,706Taxes  other than income taxes
    
    
    11,647
    
    
    
    11,710
    
    
    
    24,155
    
    
    
    24,418Other expense, net
    
    
    2,570
    
    
    
    2,583
    
    
    
    3,763
    
    
    
    4,003Total operating costs and expenses
    
    
    198,897
    
    
    
    229,212
    
    
    
    405,311
    
    
    
    424,928Operating Income
    
    
    77,784
    
    
    
    84,042
    
    
    
    172,419
    
    
    
    178,505Other (Income) and Other Deductions:Interest expense
    
    
    23,733
    
    
    
    23,549
    
    
    
    47,280
    
    
    
    47,038Interest income  affiliates
    
    
    (16
    )
    
    
    (5,031
    )
    
    
    (2,178
    )
    
    
    (9,298
    )Allowance for equity and borrowed funds
used during construction (AFUDC)
    
    
    (3,263
    )
    
    
    (2,805
    )
    
    
    (5,831
    )
    
    
    (4,934
    )Equity in earnings of unconsolidated affiliates
    
    
    (1,525
    )
    
    
    (1,530
    )
    
    
    (3,066
    )
    
    
    (2,905
    )Miscellaneous other (income) deductions, net
    
    
    78
    
    
    
    (346
    )
    
    
    1,314
    
    
    
    (2,015
    )Total other (income) and other deductions
    
    
    19,007
    
    
    
    13,837
    
    
    
    37,519
    
    
    
    27,886Income before Income Taxes
    
    
    58,777
    
    
    
    70,205
    
    
    
    134,900
    
    
    
    150,619Provision for Income Taxes
    
    
    105
    
    
    
    
    
    
    
    234
    
    
    
    Net Income
    
    $
    58,672
    
    
    $
    70,205
    
    
    $
    134,666
    
    
    $
    150,619
  5




---



##### Table of Contents



June 30,
    
    
    December 31,2010
    
    
    2009ASSETSCurrent Assets:Cash
    
    $
    112
    
    
    $
    108Receivables:Affiliates
    
    
    2,834
    
    
    
    5,132Advances to affiliates
    
    
    140,330
    
    
    
    Others, less allowance of $411 ($413 in 2009)
    
    
    94,236
    
    
    
    117,148Transportation and exchange gas receivables
    
    
    12,238
    
    
    
    7,250Inventories
    
    
    75,920
    
    
    
    39,164Regulatory assets
    
    
    64,060
    
    
    
    75,016Other
    
    
    20,285
    
    
    
    11,792Total current assets
    
    
    410,015
    
    
    
    255,610Investments, at cost plus equity in undistributed earnings
    
    
    47,427
    
    
    
    45,488Property, Plant and Equipment:Natural gas transmission plant
    
    
    7,444,694
    
    
    
    7,354,805Less-Accumulated depreciation and amortization
    
    
    2,566,356
    
    
    
    2,474,680Total property, plant and equipment, net
    
    
    4,878,338
    
    
    
    4,880,125Other Assets:Regulatory assets
    
    
    200,655
    
    
    
    197,676Other
    
    
    51,551
    
    
    
    42,884Total other assets
    
    
    252,206
    
    
    
    240,560Total assets
    
    $
    5,587,986
    
    
    $
    5,421,783
  6




---



##### Table of Contents



June 30,
    
    
    December 31,2010
    
    
    2009LIABILITIES AND OWNERS EQUITYCurrent Liabilities:PayablesAffiliates
    
    $
    45,783
    
    
    $
    24,409Other
    
    
    74,531
    
    
    
    88,780Transportation and exchange gas payables
    
    
    5,174
    
    
    
    1,434Accrued liabilities
    
    
    80,405
    
    
    
    116,226Reserve for rate refunds
    
    
    186
    
    
    
    564Total current liabilities
    
    
    206,079
    
    
    
    231,413Long-Term Debt
    
    
    1,279,348
    
    
    
    1,278,770Other Long-Term Liabilities:Asset retirement obligations
    
    
    235,816
    
    
    
    229,401Regulatory liabilities
    
    
    95,643
    
    
    
    72,021Accrued employee benefits
    
    
    
    
    
    
    6,476Other
    
    
    8,290
    
    
    
    9,145Total other long-term liabilities
    
    
    339,749
    
    
    
    317,043Contingent liabilities and commitments (Note 3)Owners Equity:Members capital
    
    
    1,652,434
    
    
    
    1,652,434Loans to parent
    
    
    
    
    
    
    (237,526
    )Retained earnings
    
    
    2,111,043
    
    
    
    2,180,367Accumulated other comprehensive loss
    
    
    (667
    )
    
    
    (718
    )Total owners equity
    
    
    3,762,810
    
    
    
    3,594,557Total liabilities and owners equity
    
    $
    5,587,986
    
    
    $
    5,421,783
  7




---



##### Table of Contents



Six Months Ended June 30,2010
    
    
    2009(Restated)Cash flows from operating activities:Net income
    
    $
    134,666
    
    
    $
    150,619Adjustments to reconcile net income to net cash provided by
(used in) operating activitiesDepreciation and amortization
    
    
    124,886
    
    
    
    122,365Allowance for equity funds used during construction (Equity
AFUDC)
    
    
    (3,993
    )
    
    
    (3,240
    )Changes in operating assets and liabilities:Receivables    affiliates
    
    
    3,789
    
    
    
    (15,559
    )  others
    
    
    22,912
    
    
    
    (13,315
    )Transportation and exchange gas receivables
    
    
    (4,988
    )
    
    
    731Inventories
    
    
    (42,197
    )
    
    
    10,256Payables    affiliates
    
    
    3,529
    
    
    
    (19,844
    )  others
    
    
    6,081
    
    
    
    (15,753
    )Transportation and exchange gas payables
    
    
    3,740
    
    
    
    (1,976
    )Accrued liabilities
    
    
    (2,615
    )
    
    
    (15,248
    )Reserve for rate refunds
    
    
    (378
    )
    
    
    (11,951
    )Other, net
    
    
    14,020
    
    
    
    (1,138
    )Net cash provided by operating activities
    
    
    259,452
    
    
    
    185,947Cash flows from financing activities:Change in cash overdrafts
    
    
    (4,674
    )
    
    
    (3,658
    )Cash distributions
    
    
    (203,791
    )
    
    
    (50,000
    )Net cash used in financing activities
    
    
    (208,465
    )
    
    
    (53,658
    )Cash flows from investing activities:Property, plant and equipment additions, net of equity AFUDC*
    
    
    (138,677
    )
    
    
    (67,400
    )Disposal of property, plant and equipment
    
    
    4,925
    
    
    
    789Advances to affiliates, net
    
    
    95,507
    
    
    
    (57,778
    )Purchase of ARO trust investments
    
    
    (33,145
    )
    
    
    (24,012
    )Proceeds from sale of ARO trust investments
    
    
    20,812
    
    
    
    16,025Other, net
    
    
    (405
    )
    
    
    306Net cash used in investing activities
    
    
    (50,983
    )
    
    
    (132,070
    )Net increase in cash
    
    
    4
    
    
    
    219Cash at beginning of period
    
    
    108
    
    
    
    428Cash at end of period
    
    $
    112
    
    
    $
    647
 
 *    Increases to property, plant and equipment
    
    $
    (107,660
    )
    
    $
    (61,217
    )Changes in related accounts payable and accrued liabilities
    
    
    (31,017
    )
    
    
    (6,183
    )Property, plant and equipment additions, net of equity AFUDC
    
    $
    (138,677
    )
    
    $
    (67,400
    )Supplemental disclosures of significant non-cash transactions:Loans to Parent reclassified to equity
    
    $
    
    
    
    $
    (16,613
    )
  8




---



##### Table of Contents



TRANSCONTINENTAL GAS PIPE LINE COMPANY, LLC
 
 NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
 1. BASIS OF PRESENTATION.
  General.
     9




---



##### Table of Contents



2. RESTATEMENT AND CHANGE IN REPORTING ENTITY.
   10




---



##### Table of Contents



3. CONTINGENT LIABILITIES AND COMMITMENTS.
 Rate Matters.
    Environmental Matters.
   11




---



##### Table of Contents



2 2
 2 2
 12




---



##### Table of Contents



Safety Matters.
 Pipeline Integrity Regulations .
 Appomattox, Virginia Pipeline Rupture.
 Other Matters.
  13




---



##### Table of Contents



Summary.
  Other Commitments.
 Commitments for construction and gas purchases
 4. DEBT, FINANCING ARRANGEMENT AND LEASES.
 Revolving Credit and Letter of Credit Facility.
    14




---



##### Table of Contents



5. FAIR VALUE MEASUREMENTS.
   
    
    Level 1  Quoted prices in active markets for identical assets or liabilities that we
have the ability to access. Active markets are those in which transactions for the asset
or liability occur in sufficient frequency and volume to provide pricing information on an
ongoing basis. Our Level 1 consists of financial instruments in our ARO Trust totaling
$32.7 million at June 30, 2010 and $22.0 million at December 31, 2009. These financial
instruments include money market funds, U.S. equity funds, international equity funds and
municipal bond funds.
    
    Level 2  Inputs are other than quoted prices in active markets included in Level 1,
that are either directly or indirectly observable. These inputs are either directly
observable in the marketplace or indirectly observable through corroboration with market
data for substantially the full contractual term of the asset or liability being measured.
We do not have any Level 2 measurements.
    
    Level 3  Includes inputs that are not observable for which there is little, if any
market activity for the asset or liability being measured. These inputs reflect
managements best estimate of the assumptions market participants would use in determining
fair value. We do not have any Level 3 measurements.
  15




---



##### Table of Contents



6. FINANCIAL INSTRUMENTS AND GUARANTEES.
 Fair value of financial instruments.
 June 30, 2010
    
    December 31, 2009Carrying
    
    Fair
    
    Carrying
    
    FairAmount
    
    Value
    
    Amount
    
    ValueFinancial assets:Cash
    
    $
    112
    
    
    $
    112
    
    
    $
    108
    
    
    $
    108Short-term financial assets
    
    
    140,537
    
    
    
    140,537
    
    
    
    
    
    
    
    ARO Trust Investments
    
    
    32,714
    
    
    
    32,714
    
    
    
    21,977
    
    
    
    21,977Long-term financial assets
    
    
    247
    
    
    
    247
    
    
    
    373
    
    
    
    373Financial liabilities:Long-term debt, including current portion
    
    
    1,279,348
    
    
    
    1,419,383
    
    
    
    1,278,770
    
    
    
    1,417,300
   7. TRANSACTIONS WITH AFFILIATES.
   16




---



##### Table of Contents



17




---



##### Table of Contents



8. COMPREHENSIVE INCOME.
  Three Months
    
    
    Six MonthsEnded June 30,
    
    
    Ended June 30,2010
    
    
    2009*
    
    
    2010
    
    
    2009*(Restated)
    
    
    
    
    
    
    (Restated)Net income
    
    $
    57,511
    
    
    $
    70,205
    
    
    $
    133,505
    
    
    $
    150,619Equity interest in unrealized gain/(loss) on
interest rate hedge
    
    
    28
    
    
    
    176
    
    
    
    51
    
    
    
    260Total comprehensive income
    
    $
    57,539
    
    
    $
    70,381
    
    
    $
    133,556
    
    
    $
    150,879
 
 *
    
    Prior year amount has been restated to reflect accounting for pension and postretirement
benefit obligations on a multi-employer accounting model (see Note 2 of Notes to Condensed
Consolidated Financial Statements). The effect of the restatement decreased Total Comprehensive
Income by $1.9 million and $4.6 million for the three and six months ended June 30, 2009,
respectively. 
 ITEM 2. Managements Discussion and Analysis of Financial Condition and Results of Operations.
 General.
  RESULTS OF OPERATIONS.
 Operating Income and Net Income.
 Operating income Net income Operating income Other Natural gas transportation Net income Operating income Other (Income) and
Other Deductions.
 Transportation Revenues.
 Operating revenues Natural gas transportation
 18




---



##### Table of Contents



Six MonthsEnded June 30,Transco System Deliveries (TBtu)
    
    2010
    
    
    2009Market-area deliveries:Long-haul transportation
    
    
    230.6
    
    
    
    363.0Market-area transportation
    
    
    729.9
    
    
    
    507.9Total market-area deliveries
    
    
    960.5
    
    
    
    870.9Production-area transportation
    
    
    85.2
    
    
    
    99.6Total system deliveries
    
    
    1,045.7
    
    
    
    970.5Average Daily Transportation Volumes (TBtu)
    
    
    5.8
    
    
    
    5.4Average Daily Firm Reserved Capacity (TBtu)
    
    
    7.0
    
    
    
    6.8
 Sales Revenues.
   19




---



##### Table of Contents



Operating revenues Natural gas sales
 Storage Revenues.
 Operating revenues Natural gas storage
 Other Revenues.
 Operating revenues Other
 Other Operating Costs and Expenses.
 ost of natural gas sales
 
    
    An increase in Cost of natural gas transportationof $2.5 million (25.5 percent)
primarily resulting from:
 
    
    A $4.2 million increase due to higher electric power costs in 2010. Electric power
costs are recovered from customers through transportation rates resulting in no net
impact on our operating income or results of operations;
    
    Partially offset by $0.6 million lower fuel expense in 2010 resulting from more
favorable pricing differentials between cost recoveries at spot prices and expenses
recognized at weighted average prices than those realized in 2009; and
    
    A $1.4 million decrease due to lower gas supply expense resulting from a settlement
of an imbalance recorded in 2009; and
 
    
    An increase in Depreciation and amortizationcosts of $3.3 million (2.7 percent)
primarily resulting from an increase in the depreciation base due to additional plant
placed in-service; and
 20




---



##### Table of Contents




    
    Partially offset by a decrease in Administrative and generalcosts of $5.1 million (6.4
percent) primarily resulting from a decrease related to labor and labor related costs,
primarily lower incentive compensation costs and pension costs; and
    
    A decrease in Other expense, netof $0.2 million (5.0 percent) primarily resulting from:
 
    
    A $7.6 million gain on the sale of Hester base gas. In October 2008, the FERC
granted us authorization to abandon our Hester Storage Field. As part of the
abandonment, we are selling the base gas. One of the provisions of the settlement
of our Docket No. RP06-569 rate case (See Note 3 of Notes to Condensed Consolidated
Financial Statements) requires that Transco share 45 percent of the gain on the sale
of the base gas with its customers. (Depending on operating conditions, it is
possible that we may sell additional Hester base gas during the
remainder of 2010, but not at levels that would be significant.); and
    
    A decrease of $1.2 million in an accrued obligation associated with an unclaimed
property audit;
    
    Partially offset by a $4.7 million increase in expense for charges related to a
regulatory liability for the over collection of postretirement benefits other than
pension costs to be returned to our customers. This amount is offset in revenues
and therefore has no impact on operating income or results from operations;
    
    A $1.8 million increase related to ARO costs;
    
    A $1.1 million increase in project development costs; and
    
    A $0.6 million increase related to the amortization of prior regulatory deferrals
for the difference between amounts collected in rates and amounts expensed for
postretirement benefits other than pension in prior periods. This amount is offset
in revenues and therefore has no impact on operating income or results from
operations.
 Other (Income) and Other Deductions.
 Other (income) and other deductions
 
    
    A decrease in Interest income affiliatesof $7.1 million due to overall lower average
advances to affiliates in 2010 as compared to the same period in 2009 and a lower interest
rate on the note advance to WPZ;
    
    Higher Miscellaneous other (income) deductions, netof $3.3 million primarily due to a
lower amount of reimbursements for tax gross-up related to reimbursable projects;
    
    Partially offset by higher Allowance for equity and borrowed funds used during
construction(AFUDC) of $0.9 million due to higher construction spending in 2010 as
compared to 2009.
 21




---



##### Table of Contents



Capital Expenditures.
  Mobile Bay South Expansion Project.
 Mobile Bay South II Expansion Project.
 85 North Expansion Project
 Pascagoula Expansion Project.
 Mid-South Expansion Project
 Mid-Atlantic Connector Project.
 22




---



##### Table of Contents



Rockaway Delivery Lateral Project
 Northeast Connector Project
 
 ITEM 3. Quantitative and Qualitative Disclosures About Market Risk.
  
 ITEM 4. Controls and Procedures.
  Evaluation of Disclosure Controls and Procedures
  Second Quarter 2010 Changes in Internal Controls
  23




---



##### Table of Contents



PART II  OTHER INFORMATION.
 
   
   24




---



##### Table of Contents



ITEM 6. EXHIBITS.
  Exhibit Number
    
    Description3.1
    
    Certificate of Conversion and Certificate of Formation,
dated December 24, 2008 and effective on December 31, 2008
(filed on February 26, 2009 as Exhibit 3.1 to the companys
Form 10-K), and incorporated herein by reference.3.2
    
    Operating Agreement of Transco dated December 31, 2008
(filed on February 26, 2009 as Exhibit 3.2 to the Companys
Form 10-K), and incorporated herein by reference.10.1
    
    Credit Agreement, dated as of February 17, 2010, by and
among Williams Partners L.P., Transcontinental Gas Pipe
Line Company, LLC, Northwest Pipeline GP, the lenders party
thereto and Citibank, N.A., as Administrative Agent (filed
as Exhibit 10.5 to Williams Partners L.P.s Current Report
on Form 8-K, filed on February 22, 2010 (File No.
001-32599) and incorporated by reference as Item 10.1 to
our Form 8-K filed February 22, 2010).10.2
    
    Administrative Services Agreement, dated as of February 17,
2010, by and between Transco Pipeline Services LLC and
Transcontinental Gas Pipe Line Company, LLC (filed as
Exhibit 10.3 to Williams Partners L.P.s Current Report on
Form 8-K, filed on February 22, 2010 (File No. 001-32599)
and incorporated by reference as Item 10.2 to our Form 8-K
filed February 22, 2010).31.1*
    
    Certification of Principal Executive Officer pursuant to
Rules 13a-14(a) and 15d-14(a) promulgated under the
Securities Exchange Act of 1934, as amended, and Item
601(b)(31) of Regulation S-K, as adopted pursuant to
Section 302 of The Sarbanes-Oxley Act of 2002.31.2*
    
    Certification of Principal Financial Officer pursuant to
Rules 13a-14(a) and 15d-14(a) promulgated under the
Securities Exchange Act of 1934, as amended, and Item
601(b)(31) of Regulation S-K, as adopted pursuant to
Section 302 of The Sarbanes-Oxley Act of 2002.32 **
    
    Certification of Principal Executive Officer and Principal
Financial Officer pursuant to 18 U.S.C. Section 1350, as
adopted pursuant to Section 906 of the Sarbanes-Oxley Act
of 2002.
 
 *
    
    Filed herewith.**
    
    Furnished herewith. 25




---



##### Table of Contents



TRANSCONTINENTAL GAS PIPE
LINE COMPANY, LLC 
(Registrant)Dated: July 29, 2010
    By:
    /s/ Jeffrey P. HeinrichsJeffrey P. HeinrichsController and Assistant Treasurer
(Principal Accounting Officer) 26




---



##### Table of Contents



EXHIBIT INDEX.
 Exhibit Number
    
    Description3.1
    
    Certificate of Conversion and Certificate of Formation,
dated December 24, 2008 and effective on December 31, 2008
(filed on February 26, 2009 as Exhibit 3.1 to the companys
Form 10-K), and incorporated herein by reference.3.2
    
    Operating Agreement of Transco dated December 31, 2008
(filed on February 26, 2009 as Exhibit 3.2 to the Companys
Form 10-K), and incorporated herein by reference.10.1
    
    Credit Agreement, dated as of February 17, 2010, by and
among Williams Partners L.P., Transcontinental Gas Pipe
Line Company, LLC, Northwest Pipeline GP, the lenders party
thereto and Citibank, N.A., as Administrative Agent (filed
as Exhibit 10.5 to Williams Partners L.P.s Current Report
on Form 8-K, filed on February 22, 2010 (File No.
001-32599) and incorporated by reference as Item 10.1 to
our Form 8-K filed February 22, 2010).10.2
    
    Administrative Services Agreement, dated as of February 17,
2010, by and between Transco Pipeline Services LLC and
Transcontinental Gas Pipe Line Company, LLC (filed as
Exhibit 10.3 to Williams Partners L.P.s Current Report on
Form 8-K, filed on February 22, 2010 (File No. 001-32599)
and incorporated by reference as Item 10.2 to our Form 8-K
filed February 22, 2010).31.1*
    
    Certification of Principal Executive Officer pursuant to
Rules 13a-14(a) and 15d-14(a) promulgated under the
Securities Exchange Act of 1934, as amended, and Item
601(b)(31) of Regulation S-K, as adopted pursuant to
Section 302 of The Sarbanes-Oxley Act of 2002.31.2*
    
    Certification of Principal Financial Officer pursuant to
Rules 13a-14(a) and 15d-14(a) promulgated under the
Securities Exchange Act of 1934, as amended, and Item
601(b)(31) of Regulation S-K, as adopted pursuant to
Section 302 of The Sarbanes-Oxley Act of 2002.32 **
    
    Certification of Principal Executive Officer and Principal
Financial Officer pursuant to 18 U.S.C. Section 1350, as
adopted pursuant to Section 906 of the Sarbanes-Oxley Act
of 2002.
 
 *
    
    Filed herewith.**
    
    Furnished herewith. 27